Dental-crown construction.



' G. A. SKALSTAD.

DENTAL GROWN CONSTRUCTION.

, APPLIOATION FILED 111N314, 190a.

PATBNTED OCT. 16, 1906.

UNITED STATES PATENT OFFICE.

DENTAL-CROWN CONSTRUCTION.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application filed June 14, 1905. Serial No. 265,224.

To all whom it may concern.-

Be it known that I, CARL A. SKALSTAD, a citizen of the United States of America, and a resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Dental-Crown Construction, of which the following is a specification.

My invention relates to dental-crown construction in generalthat is, to the crown constructions employed by dentists in securing artificial teeth to the roots of teeth which have become more or less impaired and which have been cut off, leaving in each case a stump or root to which the artificial tooth can be suitably secured.

Generally stated, the object of my invention is the provision of an improved and highly-efficient dental-crown construction.

Special objects of my invention are the provision of an improved construction or arrangement of the different parts of the crown, whereby the means for securing the artificial tooth to the stump or root are wholly concealed, thereby obviating the necessity of employing the well-known band around the outside of the stump or root, which feature of the old construction has always been more or less unsightly and objectionable in many ways, the provision of an improved construction and arrangement whereby the artificial toothcan be secured to the stump or root by means of a flanged plate having its perimeter inserted in a circular groove formed in the face of the said stump or root and having its face and back provided with oppositely-projecting pins or metal portions adapted, respectively, to be secured to the artificial tooth and the said stump or root, and the provision of certain details and features of improvement tending to increase the general efficiency, serviceability, and desirability of a dental-crown construction of this particular character.

To the foregoing and other useful ends my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is an oustide or front view of an artificial tooth secured to a stump or root by means involving the principles of my invention. Fig. 2 is a vertical section on line 2 2 in Fig. 1. Fig. 3 is a perspective of the stump or root shown in Fig. 1. Fig. 4 is a perspective of the metal crown construction before it is secured at one end to the artificial tooth and at the other end to the said stump or root. Fig. 5 is'a horizontal section on line 5 5 in Fig. 2. Fig. 6 is a view similar to Fig. 4, showing the face of the dental-crown construction rather than the back.

As thus illustrated, the metallic portion of my improved crown construction consists of a cup-shaped plate A, having a flange a on its back and having a smooth face or lower surface a. At its center the face of the said plate is provided with a pin or projection (1 A similar pin or projection (1 projects from the central portion of the back of the plate. As shown, the said plate and its pins are of one integral piece of metal; but it will be readily understood that this cup-shaped plate can be made separately in any suitable manner and the pins or projections then attached to the cup in any suitable manner and by any suitable means. In other words, this metallic portion of my improved dentalcrown construction can be manufactured in any suitable known or approved manner and can be made in one piece or in several, according to the conditions and facilities of different dentists. As thus made the plate A is ready to be secured to the stump or root B and also to the artificial tooth C. Preliminary to so doing a hole I) and an annular groove or channel I) are formed in the face or finished outer end of the stump or root B, as shown more clearly in Fig. 3. This of course can be done by means-of any suitable tool or tools. The pin or projection a is then secured to the artificial tooth O by any suitable meansas, for example, by the pins 0, which are shown in Fig. 5 in forked position and which are inserted in the artificial tooth and then soldered or otherwise secured to the pin or projection a After this the pin or projection a is then inserted in the opening I), and then the annular flange a is fitted into the annular groove or channel b. Any suitable means or any suitable expedient can be employed for fastening the flange a in the groove 1) and securing the pin or projection a in the opening b. After the artificial tooth is thus metallically and securely connected with the stump or root a suitable quantity of porcelain, gold, silver, or other known material D can be filled in around the metal connection, so as to give the work a satisfactory and finished rear or inner surface. Thus applied the artificial tooth is nicely and securely held in place upon the end of the stump or root and without resorting to the well-known V or usual band around the end of the stump or IIO root. In addition to thus eliminating the unsightly band of the old crown construction I also find that my improved dental-crown construction may be employed and applied in a manner which is comparatively less painful than heretofore.

What I claim as my invention is- 1. A dental-crown construction comprising a flanged plate having its flanged back provided with a pin, both the flange and the pin being inserted in the stump or root, and the face or outer surface of the said plate having a pin or projection extending therefrom, an integral projection extending laterally from said pin, together With an artificial tooth suitably secured to said pin or projection.

2. A dental-crown construction comprising a root, an artificial tooth, a pin adapted to be inserted in said root, a circular metallic member surrounding said pin adapted to secure said pin to said root, and a forked me. tallic member integral therewith extending laterally from said pin and adapted to secure said pin to said tooth.

Signed by me this 31st day of May, 1905.

CARL A. SKALSTAD.

Witnesses:

SARAH LEWIS, ALBERT SAUSER. 

